NEW YORK — It all started with a primitive video game called Pong and the Atari 2600 console for at-home gaming, which debuted in the 1970s. Though its games had simple graphics, Atari revolutionized the gaming industry. Video games are now light years better, smaller and more complex. Legions of players collect them, and anything related to them, driven by childhood nostalgia and the desire to preserve cultural touchstones. There is also profit to be made.